عن أبى سعيد الخدرى رضى الله عنه
أن النبي صلى الله عليه وسلم نهى عن النفخ في الشراب، فقال رجل: القذاة أراها في الإناء؟ فقالب: «أهرقها«قال: إني لا أروى من نفس واحد؟ قال: «فأبن القدح إذاً عن فيك»
The Messenger of Allah (sallallahu alayhi wa sallam) prohibited us blowing in the drinking water. A man said: “O Messenger of Allah! Sometimes I see some litter floating about on the surface. What should I do then?” He (sallallahu alayhi wa sallam) replied, “Pour them out.” Then the man said: “My thirst is not quenched with one draught.” Messenger of Allah (sallallahu alayhi wa sallam) said, “Then put away the cup from your mouth (in between three gulps), and take breath.”.
Riyad as-Salihin 764, Book 3, The Book About the Etiquette of Eating, Hadith 38. 1 min read